ccm problem???
Thread Starter
Instructor
Joined: Sep 2004
Posts: 210
Likes: 0
From: peoria il
ccm problem???
i have 91 coupe auto. next to the mph numbers the cat is flashing "sys" three times and it has done it 20 or 30 different times. the car is running great and the manual says there is a problem with the central control module. is there someway to check for the problem w/out going to the dealership?? any idea what the problem is? thanks jeff
Pro
Joined: Nov 2002
Posts: 665
Likes: 2
From: Southington CT
sounds like you need to check your codes. its fully explained in the service manual with full description of the fault code. If you dont have a manual I can get mine and post the procedure for you. good luck.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
jump A and G.
check this thread for some instructions on how to do this - scan down a bit, its about midway through.
http://forums.corvetteforum.com/showthread.php?t=933175
check this thread for some instructions on how to do this - scan down a bit, its about midway through.
http://forums.corvetteforum.com/showthread.php?t=933175
Thread Starter
Instructor
Joined: Sep 2004
Posts: 210
Likes: 0
From: peoria il
ok i checked my codes and here is what i have
1. code 31-lcd data circuit(circuit shorted to battery voltage or ccm internal open)
2. code 33-data clock circuit(circuit shorted to battery voltage or ccm internai open)
3. code 35-data strobe circuit(circuit shorted to battery voltage or ccm internal open)
4. code 37-m clock circuit(circuit shorted to battery voltage or ccm internal open)
i just had my bose stereo removed and a new cd player installed could that be the cause of my problem? if so can i correct it and how? if that is not the problem please help thanks..........
1. code 31-lcd data circuit(circuit shorted to battery voltage or ccm internal open)
2. code 33-data clock circuit(circuit shorted to battery voltage or ccm internai open)
3. code 35-data strobe circuit(circuit shorted to battery voltage or ccm internal open)
4. code 37-m clock circuit(circuit shorted to battery voltage or ccm internal open)
i just had my bose stereo removed and a new cd player installed could that be the cause of my problem? if so can i correct it and how? if that is not the problem please help thanks..........
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
Originally Posted by rugby!
ok i checked my codes and here is what i have
1. code 31-lcd data circuit(circuit shorted to battery voltage or ccm internal open)
2. code 33-data clock circuit(circuit shorted to battery voltage or ccm internai open)
3. code 35-data strobe circuit(circuit shorted to battery voltage or ccm internal open)
4. code 37-m clock circuit(circuit shorted to battery voltage or ccm internal open)
i just had my bose stereo removed and a new cd player installed could that be the cause of my problem? if so can i correct it and how? if that is not the problem please help thanks..........
1. code 31-lcd data circuit(circuit shorted to battery voltage or ccm internal open)
2. code 33-data clock circuit(circuit shorted to battery voltage or ccm internai open)
3. code 35-data strobe circuit(circuit shorted to battery voltage or ccm internal open)
4. code 37-m clock circuit(circuit shorted to battery voltage or ccm internal open)
i just had my bose stereo removed and a new cd player installed could that be the cause of my problem? if so can i correct it and how? if that is not the problem please help thanks..........
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The flashing SYS display can indicate a bad battery. Watch the voltage display. With the ignition at the RUN position, you should see readings around 11.8 to 12.3 or so. With the engine running, you should see voltage readings ranging from 14.8 to 13.6. If you see values around 12 or so with the engine running, have a load test performend on the battery and have the alternator tested for proper output.
The fact that you had an aftermarket audio system could also be the issue. I have read posts about this same thing happening when the factory system is removed. I would post your problem again over in the Audio/Electronics section. I believe there is a resistor that needs to be installed on a wire to keep the code from showing and the SYS message flashing.
The fact that you had an aftermarket audio system could also be the issue. I have read posts about this same thing happening when the factory system is removed. I would post your problem again over in the Audio/Electronics section. I believe there is a resistor that needs to be installed on a wire to keep the code from showing and the SYS message flashing.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
